<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            position: absolute;
            width: 100px;
            height: 100px;
            background-color: pink;
        }
    </style>
</head>

<body>
    <button>按钮</button>
    <div></div>
    <script>
        var button = document.querySelector('button');
        var div = document.querySelector('div');

        function animate(obj, target) {
            clearInterval(obj.time);
            obj.time = setInterval(function() {
                if (obj.offsetLeft >= target) {
                    clearInterval(obj.time);
                }
                obj.style.left = obj.offsetLeft + 1 + 'px';
            }, 30)
        }
        // animate(div, 200)
        button.addEventListener('click', function() {
            animate(div, 200);
        })
    </script>
</body>

</html>